Mini Power Problem

My mini (2009, Intel core2 duo, Snow Leopard, up to date) has a power problem. Perhaps it has overheated.
It shut down unexpectedly, without warning.
I try to start it by pressing the power button. The power light turns on briefly. there is no chime. Then the light goes out.
I tried resetting the SMC. No effect. I tried holding the power button in. The light stayed on for several seconds, then flashed rapidly 10 times, and turned off.
I have given it over half an hour to cool, and placed a fan behind it to help.
No change.
Thoughts?
Other minor points. I upgraded the RAM and hard disk 6 months ago. No problem.
It is running dual monitors, Wireless is turned off, ethernet is on, and I have a speaker plugged through the firewire port. But I tried disconnecting everything and restarting naked. No help.
I'll try again now... nope. Please advise.

Next bit of data. The chime does not happen. That seems to have been a single occurrence. I've opened the mini, and see the internal green LED on the motherboard is lit. When I hit the power button, then may be a tiny whirr. I'm not sure whether it is the disk or a fan. But it lasts a fraction of a second, then the main external power light goes out, and the motherboard green light also goes off, then comes back on. I'm thinking there may be a big power draw (disk drive? Fan?) exceeding the power available, and it shuts off. Possible?

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